<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <script>
// var arr=[1,2,3]

// // console.log(arr);


// arr.length=4;
// // console.log(arr);

// var arr1=arr;

// console.log(arr);
// console.log(arr1);

// arr[4]='hello'

// console.log(arr);

// console.log(arr1);


//简单数据类型 

var aa=10;
var bb=aa;
aa=11;
console.log(aa);
console.log(bb);




    </script>
</body>
</html>